Effects of Cetylpyridinium Chloride on Phase and Rheological Behavior of the Diluted C12E4/Benzyl Alcohol/Water System

Montalvo, Gemma; Rodenas, E.; Valiente, Mercedes

doi:10.1006/jcis.2000.6872

Cited by 24 publications

(23 citation statements)

References 14 publications

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“…If the micelles are large enough to be highly flexible at the maximum concentration value, viscosity will decrease. The same behavior was found in microemulsions with HM-PEG (Karlsson, et al, 1999) and for micelles in systems with surfactants (Karlsson, et al, 1999;Antunes, et al, 2003;Montalvo, et al, 2003). Continually increasing the surfactant content (Acid S40P) resulted in an abrupt decrease in the viscosity up to a composition of 70% surfactant.…”

Section: Determination Of Viscoelastic Behaviorsupporting

confidence: 64%

“…All of its values are greater than 1, which indicates a greater viscosity than elasticity in the samples (Montalvo, et al, 2003). In this particular case, the sample of composition 50% Acid S40P/5.5% lecithin (sample 28) has higher tangent loss values than those of the sample of composition 54% Acid S40P/6% lecithin (sample 5), which means that the highest elastic contribution is found in sample 5, whose composition was 54% Acid S40P/6% lecithin.…”

Section: Determination Of Viscoelastic Behaviormentioning

confidence: 88%

See 1 more Smart Citation

Study and characterization of the micellar phase of the polyethylene glycol 40 stearate, water, and soy lecithin system

Lagos

Montalvo

Valiente

et al. 2016

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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Hydrophobically modified polymers (HMPs) have become of great importance as modifiers of rheological behavior, and as thickening agents for a great variety of products such as paints, foods, cosmetics, and medicines. HMPs are able to dissolve hydrophobic and hydrophilic molecules, just like surfactants. This means that HMPs combine the properties of surfactants and polymers. In this paper, the ability of HMPs to self-aggregate in water and in the presence of soy lecithin (a natural lipid which behaves as a dipolar surfactant) was studied. The characterization of the micellar phase of the soy lecithin/polyethelyne glycol 40 stearate (Acid S40P, nonionic)/water ternary system is presented by way of surface tension, optic microscope, and rheology methods. From the results, it is deduced that non-spherical micellar aggregates are formed, which orient in the direction of the flow under shear stress. Oscillation tests allowed for the determination that the viscous modulus G'' is greater than the elastic modulus G', with behavior described by the Maxwell model. © 2016. Acad. Colomb. Cienc. Ex. Fis. Nat. Key words: Lipids; Soy lecithin; Hydrophobically modified polymers; Surface tension; Optic microscope; Rheology. Estudio y caracterización de la fase micelar del sistema formado a partir del polietilenglicol 40 estearato, agua y lecitina de soja ResumenLos polímeros hidrofóbicamente modificados (PHM) han adquirido una gran importancia como modificadores de comportamiento reológico, agentes espesantes en una gran variedad de productos como son pinturas, alimentos, cosmética o medicamentos. Estos polímeros PHM tiene la capacidad de solubilizar moléculas hidrofóbicas al igual que los tensioactivos. Es decir, los PHM combinan las propiedades de los tensioactivos y de los polímeros. En este trabajo en general se estudiará la capacidad de los PHM de autoagregarse y comportarse como tensioactivos. Se presenta el estudio de la fase micelar del sistema ternario lecitina de soja (lípido natural que se comporta como tensioactivo doblemente iónico)/ polietilenglicol 40 estearato (Acid S40P, no iónico)/agua. La caracterización se realiza mediante los métodos de tensión superficial, microscopia óptica y reología. De los resultados se deduce que se forman agregados micelares no esféricos que se orientan en la dirección del flujo bajo los esfuerzos de cizalla. Los ensayos de oscilación permitieron determinar que el modulo viscoso G´´ es superior al elástico G´, con un comportamiento descrito por el modelo de Maxwell de un elemento.

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Section: Determination Of Viscoelastic Behaviorsupporting

confidence: 64%

Section: Determination Of Viscoelastic Behaviormentioning

confidence: 88%

Study and characterization of the micellar phase of the polyethylene glycol 40 stearate, water, and soy lecithin system

Lagos

Montalvo

Valiente

et al. 2016

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

View full text Add to dashboard Cite

show abstract

“…• C, was reported (11). The presence of CPyCl surfactant stabilizes the closed bilayer structures (vesicles) and thereby leads to disappearance of the L αh -and L 3 -phase regions.…”

Section: Introductionmentioning

confidence: 90%

“…Moreover, both phase boundaries are almost parallel. The L + α -phase solubilizes progressively larger amounts of CPyCl upon increasing the alcohol concentration in the sample, whereas in the system with water, at [alcohol] >25 mM, the L + α -phase solubilizes a constant content of CPyCl, 0.4 mM (11). With respect to the 2φ/L 1 -phase boundary, the dent around 40 mM of alcohol present in the H 2 O system (11) disappears in the presence of D 2 O (Fig.…”

Section: Iii1 Phase Diagram Of the C 12 Ementioning

confidence: 97%